$$48\div6[-52\div2\{4-3(2-15\div3)\}]$$
$-2704$
$$8\times \frac{-52}{2}\left(4-3\left(2-\frac{15}{3}\right)\right)$$
$$8\left(-26\right)\left(4-3\left(2-\frac{15}{3}\right)\right)$$
$$-208\left(4-3\left(2-\frac{15}{3}\right)\right)$$
$$-208\left(4-3\left(2-5\right)\right)$$
$$-208\left(4-3\left(-3\right)\right)$$
$$-208\left(4-\left(-9\right)\right)$$
$$-208\left(4+9\right)$$
$$-208\times 13$$
$$-2704$$
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